11
2551 Magmeter
•
Conductivity is less than 20
μ
S/cm.
•
Electronic component failure.
•
Loop device not scaled same as
Magmeter.
•
Range Jumper not placed correctly.
• Defective
Magmeter
•
Magmeter installed too close to
upstream obstruction.
•
Electrodes coated with solids.
•
Electrodes exposed to air bubbles.
•
Electrical noise interference.
•
New sensor, metal surface not
properly conditioned.
•
Output is not 0 when
fl
ow is stopped.
•
Frequency, Digital or Current
output is erratic.
•
Output is 22.1 mA.
•
Electrode not adequately conditioned.
•
Electrical noise interference.
•
Vibration or other movement in pipe
causes magmeter to detect
fl
ow.
• Defective
Magmeter
Symptom
Possible Cause
Possible Solution
•
Frequency output is inoperative
• Digital
(S
3
L) output is inoperative.
•
Loop output is inoperative.
•
Move the Magmeter upstream at least
10 pipe diameters from obstruction.
•
Clean the electrodes with soft cloth.
Do not use abrasives.
•
Eliminate air bubbles in the pipe.
•
Remove the Magmeter and reinstall
with the
fl
ow direction arrow on the
sensor body pointed DOWNSTREAM.
•
Modify grounding as required
to protect the Magmeter from
interference.
•
Soak sensor overnight in
fl
uid.
11.2
Troubleshooting
11. Maintenance
The 2551 Magmeter requires very little maintenance. There are no user-serviceable components in the Magmeter.
• If
the
fl
uid contains deposits and solids that may coat the electrodes, a regular cleaning schedule is recommended.
•
Do not use abrasive materials on the metal electrodes. Clean with soft cloth and mild detergent only.
•
Use a cotton swab and mild detergent to remove deposits on the metal electrodes at the tip of the sensor.
11.1.
Environmental Recommendations:
•
When used properly, this product presents no inherent danger to the environment.
•
Please follow local ordinances when disposing of this or any product with electronic components.
•
Soak sensor overnight in
fl
uid.
•
Modify grounding to protect the
Magmeter from interference.
• Set
low
fl
ow cutoff higher.
•
Return to factory for service.
•
Use 3-0250 Setup tool to respan the
Magmeter to match Loop device.
•
Respan Loop device to match
Magmeter.
•
Set Range Jumper correctly.
•
Return to factory for service.
•
2551 is wrong model.
•
Blue jumper not in correct position.
•
Wiring is not correct.
•
Frequency input to other
manufacturer's
fl
ow instrument does
not have pull-up resistor.
•
Frequency model is 3-2551-11.
•
Place blue jumper correctly.
(Sec. 5 pg. 4)
•
Check wiring, make corrections.
• Install
10k
Ω
resistor. (Sec 8.1, pg. 6)
•
Unsuitable application for Magmeter.
Return to factory for service.
•
4-20 mA output is incorrect.
11.3 Troubleshooting with the RED and BLUE lights
No Lights:
The power is off or the sensor is not connected
Solid Blue:
The power is on but there is no
fl
ow in the pipe.
Blinking Blue:
Normal operation, blink rate is proportional to the
fl
ow rate.
Alternating Red-Blue:
Empty pipe indication (electrodes are not wet.)
Blinking Red:
System errors (Electrical noise interference)
Solid Red:
Instrument error (defective electronics component)
1
2
3
4
D7
D6
Flow
Flow
If the 2551 detects an Empty Pipe:
•
Frequency output will be locked to 0 Hz if electrodes are not wet.
• Digital
(S
3
L) output will be locked to 0 if electrodes are not wet.
•
4-20 mA will be locked to 4 mA if electrodes are not wet.
•
Blue and Red LED indicators on the magmeter circuit will blink alternately if electrodes are not wet.
If the 2551 detects REVERSE FLOW:
•
Frequency out cannot distinguish reverse
fl
ow from forward
fl
ow. The output will be the absolute value.
• Digital
(S
3
L) output: Reverse
fl
ow results in 0
fl
ow rate displayed on 8900
•
4-20 mA output can be spanned into negative
fl
ow range using the 3-0250 USB Setup Tool and software. (See section 9)
(example: 4-20 mA = -100 to +100 GPM)
